EP 1142888 B1 20040908 - Process for the preparation of Dialcoxythiophenes and Alkylendioxythiophenes
Title (en)
Process for the preparation of Dialcoxythiophenes and Alkylendioxythiophenes
Title (de)
Verfahren zur Herstellung von Dialkoxythiophenen und Alkylendioxythiophenen
Title (fr)
Procédé pour la préparation de dialcoxy thiophène et alcoylèndioxy thiophène
Publication
Application
Priority
DE 10016723 A 20000404
Abstract (en)
[origin: EP1142888A1] In the preparation of 3,4-dialkoxy- or 3,4-alkylenedioxy-thiophenes (I) or (II) by decarboxylation of the corresponding 3,4-dialkoxy- or 3,4-alkylene-dioxo-2,5-thiophene-dicarboxylic acids (III) or (IV), (i) decarboxylation is carried out in a solvent or diluent with a higher boiling point than (I) or (II), which is not an aromatic amine; and (ii) the end product is separated from this solvent or diluent by distillation. In the preparation of 3,4-dialkoxy- or 3,4-alkylenedioxy-thiophenes of formula (I) or (II) by decarboxylation of the corresponding 3,4-dialkoxy- or 3,4-alkylene-dioxo-2,5-thiophene-dicarboxylic acids of formula (III) or (IV): (i) decarboxylation is carried out in a solvent or diluent with a higher boiling point than (I) or (II), which is not an aromatic amine; and (ii) the end product is separated from this solvent or diluent by distillation. R<1>, R<2> = linear or branched 1-15 carbon (C) alkyl; X = optionally substituted -(CH2)n-; n = 1-12.
IPC 1-7
IPC 8 full level
C07D 495/06 (2006.01); C07D 333/32 (2006.01); C07D 495/04 (2006.01)
CPC (source: EP KR US)
C07D 333/32 (2013.01 - EP US); C07D 495/04 (2013.01 - EP US); C07D 495/06 (2013.01 - KR); Y02P 20/582 (2015.11 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1142888 A1 20011010; EP 1142888 B1 20040908; AT E275555 T1 20040915; DE 10016723 A1 20011011; DE 50103504 D1 20041014; DK 1142888 T3 20041206; ES 2228680 T3 20050416; JP 2001288182 A 20011016; JP 4822601 B2 20111124; KR 100714944 B1 20070507; KR 20010095255 A 20011103; TW I298069 B 20080621; US 2001034453 A1 20011025; US 6369239 B2 20020409
DOCDB simple family (application)
EP 01106444 A 20010323; AT 01106444 T 20010323; DE 10016723 A 20000404; DE 50103504 T 20010323; DK 01106444 T 20010323; ES 01106444 T 20010323; JP 2001092829 A 20010328; KR 20010017575 A 20010403; TW 90107289 A 20010328; US 81387501 A 20010321